| 摘要: |
| 基于河北省1965—2015年25个典型气象站汛期（6—9月）逐日降水资料，利用小波分析、Mann-Kendall 法和合成分析法对降水集中度（PCD）和集中期（PCP）时空变化特征进行分析。结果表明：①PCD值为0.18～0.56，PCP值为47.26°～194.70°，汛期最大降水集中在7月上旬和中旬；PCD和PCP均存在35 a左右的主周期和20 a左右的次周期；近50年，PCD和PCP均不存在突变年份。②PCD由东南向西北方向递减；河北南部PCP由东北向西南逐渐推迟，河北北部PCP由承德地区向东西两个方向逐渐推迟。③多水年和少水年PCD的空间分布均由东南向西北递减，但多水年的PCD高值区多于少水年；多水年和少水年PCP空间分布较一致，河北南部PCP由中部地区向南北两侧逐渐推迟，河北北部PCP由丰宁和围场向东西两侧逐渐推迟，但少水年比多水年PCP时间范围更长，空间差异更大。④从相关分析来看，汛期降水量与全省PCD 具有较好的正相关性，仅与承德、涉县、清河和馆陶的PCP存在较好的负相关性。 |
| 关键词: 汛期 降水 降水集中度 降水集中期 时空特征 河北省 |
| DOI： |
| 分类号:P33 |
| 基金项目:国家自然科学基金资助项目(51579126,51779114)； 长江水利委员会长江科学院2016年对外开放研究基金资助项目（CKWV2016392/KY） |
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| Temporal and spatial characteristics of precipitation concentration degree and concentration period in flood season in Hebei Province |
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CAO Yongqiang, LI Xiaorui
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College of Urban Planning and Environmental Science, Liaoning Normal University, Dalian
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| Abstract: |
| Based on the daily precipitation data of 25 typical meteorological stations in Hebei province from 1965 to 2015 (June to September), the spatial and temporal variation characteristics of the precipitation concentration degree(PCD) and the precipitation concentration period (PCP) are analyzed by wavelet analysis and Mann-Kendall as well as the synthetic analysis method. The analysis results show that: ① The PCD value is between 0.18～0.56，and the PCP value is between 47.26°～194.70°, the maximum precipitation in the flood season is concentrated in early and mid of July; both PCD and PCP exist in the main period of about 35 years and sub cycles about 20 years; in the last 50 years, neither PCD nor PCP has mutation years. ②PCD decreases from southeast to northwest, and the PCP in southern Hebei Province is gradually delayed from the northeast to southwest, the PCP of the northern Hebei Province is gradually delayed from the Chengde region to the east and the west in two directions. ③The spatial distribution of the PCD in the more-water year and the less-water year decreases from the southeast to the northwest, but the high value area of the PCD in the more-water year is more than that of the less-water year; The spatial distribution of the PCP is consistent in the more-water year and the less-water year, the PCP in the southern Hebei Province is gradually postponed from the central region to the north and the south sides, the PCP in the northern Hebei Province is gradually postponed from Fengning and Weichang to the east and the west sides, but compared with the more-water year, the PCP range of the less-water year is longer, and its spatial differences are greater. ④From the relevant analysis, the precipitation in the flood season has a good positive correlation with PCD in the whole province, and only has a good negative correlation with the PCP of Chengde, Shexian, Qinghe and Guantao. |
| Key words: flood season rainfall precipitation concentration degree(PCD) precipitation concentration period (PCP) spatial and temporal distributions Hebei Province |
